Legend:

In the first picture the camera is outside the Groups Visibility Volume (denoted by the green dots): only the sphere which is not part of the group is visible. The second picture shows what happens when the camera is within the volume. The others spheres appear as well. You can [[Attach:dsVisGroup.zip download this demonstration]]. The .MAX, .OSG and Images are included in the archive.

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In the first picture the camera is outside the Groups Visibility Volume (denoted by the green dots): only the sphere which is not part of the group is visible. The second picture shows what happens when the camera is within the volume. The others spheres appear as well. You can [attachment:dsVisGroup.zip download this demonstration]. The .MAX, .OSG and Images are included in the archive.